package com.atguigu.admin.interceptor;

import lombok.extern.slf4j.Slf4j;
import org.springframework.ui.Model;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * ClassName: LoginInterceptor
 * Package: com.atguigu.admin.interceptor
 * Description:登陆检查
 *登录检查
 * 1.配置好拦截器要拦截那些请求
 * 2.把这些配置放在容器中
 * @Author Root
 * @Create 2023/4/4 10:21
 * @Version 1.0
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        log.info("拦截的请求是:{}",requestURI);
        //登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser!=null){
            //放行
            return true;
        }
        //拦截住，未登录，跳转到登录页
        request.setAttribute("msg","未登录，请登录您的账号");
       // response.sendRedirect("/");
        request.getRequestDispatcher("/").forward(request,response);
        return false;
    }

    /**
     * 目标方法执行之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
       log.info("postHandle执行:{}",modelAndView);

    }

    /**
     * 页面渲染以后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
     log.info("afterCompletion执行异常:{}",ex);
    }
}
